An Environmental Impact Report (EIR) is a document required under the California Environmental Quality Act (CEQA). It describes a particular project location in its existing setting, describes the impacts which a project will have on the environment both on and adjacent to the property, and proposes mitigation measures.

In some ways it is similar to an Environmental Impact Statement (EIS) as required by the NEPA, though it can be seen as being more stringent. An environmental impact statement (EIS) is an examination of the effects on the environment that will occur if a particular action is taken. ... EIS can stand for: Epigenetic inheritance system Educational Institute of Scotland Environmental impact statement Enhanced Imaging System Enterprise Information System Executive information system Enterprise Investment Scheme Entry into service This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The National Environmental Policy Act (or, NEPA) was signed into law on January 1, 1970 by US President Richard Nixon. ...